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Subject: VIRTIO RPMB Front End drivers for Linux


I'm currently working on a vhost-user backend for virto-rpmb as defined
in the draft version of the OASIS spec (since 8c6acac2). I'm developing
it within the QEMU source tree but it is intended to be a portable
vhost-user binary with minimal POSIX like dependencies.

Part of the aim of the project is to experiment with a vhost-user
backend that has minimal access to guest memory and RPMB makes sense as
the vhost-user daemon only really needs to see the virt queues to pass
the data back and forth. One eventual architecture would be to move the
vhost-user driver into it's own isolated VM with only minimal memory
sharing between the guest and it's back-end.

I've gotten enough of the plumbing working now that I'm ready to start
implementing the RPMB spec itself. I've been looking for a front-end to
use in testing and I found the Linux driver sitting in Project ACRN's
guest kernel fork. With this kernel and VIRTIO_ID_RPMB tweaked to the
standard based one I get far enough that the driver is initialised
before my drivers falls over when an un-handled feature is requested
(0x130000000). This is slightly confusing because the spec doesn't
define any feature bits. So a few questions:

  - how divergent is the virtio-rpmb front/back-end in ACRN from the
    OASIS spec?

  - is there likely to be another submission to the upstream kernel?

I've also read the document on the ACRN website which talks about the
secure architecture:


I was wondering if there was any low level usage information. From
looking at the Kconfig options it seems the virtio-rpmb driver
interfaces with a wider RPMB sub-system which exposes a character device
to the kernels user-space. So:

  - are there any special user-space tools to use this interface?

  - is there a write-up somewhere of how to exercise the interface or
    any sort of test suite?

Thanks in advance,

Alex BennÃe

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